Really? Well... With that "useless" whip I killed Jenny in ghost town quest - before I got to level 45 that is needed for Belle Star. Just an example, that wasn't the only one place where the whip was nifty.
Besides that, jobs that need both hiding and reflex are:
stealing horses - Bowie's knife gives 10, Belle Star only 9
robbing settlers - true, Belle Star is the best weapon for this job
transporting prisoners - Precise schofield adds 14 LP here, Belle Star only 9
We can hardly say that Belle Star is good for anything except for duels.
You may think whatever you want, but Belle Star adds already overpowered soldiers even more power on level 40 (if they use premium) or level 42 (if they don't use premium). Other classes don't have that much benefits from it.